Orthodontic appliance



FIG. 1 is a perspective view of the orthodontic appliance;

FIG. 2 is a top view is a right side view of the design of FIG. 1;

FIG. 3 is a right side view of the design of FIG. 1;

FIG. 4 is a front view of the design of FIG. 1;

FIG. 5 is a left side view of the design of FIG. 1;

FIG. 6 is a back view of the design of FIG. 1;

FIG. 7 is a bottom view of the design of FIG. 1; and,

FIG. 8 is a perspective view of the design of FIG. 1 with the spring element removed.

The broken lines shown in the figures represent portions of the orthodontic appliance that form no part of the claimed design. 

CLAIM The ornamental design for the orthodontic appliance, as shown and described. 